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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b024800e3caf88aaa54d6833984c933fb1d993de8da9d3789c0b1fa393d71077' 
  AND token = 'UTE07uhtwD5UcbPu7uXVXi6+eIXGHAUf1/fUeBHNnNw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}